[jaszman]

laman, to the best of my knowledge there is no way to use one phone in place of the other they as are two two totally different technologies (CDMA vs GSM) and one will not work on the others network.

Sorry to say you have to get a new phone for your Verizon service. You might try swapping or selling your phone here on the forums. Just remember that you will need a CDMA phone for Verizon network, and if you are considering using another CDMA phone that is not Verizon branded it will have to be unlocked. (I believe I've seen somewhere in the forums that Sprint phones will not work on Verizon, but I'm not positive)

Good luck